Portable motor-saw for felling trees, cutting logs, and sawing wood



.'P'o'RTALE Moms sAw Foa' FIEL k-n.1.LAGUs.

LING TREES, CUTTING LOGS, AND SAWING WOOD. APPLICATION man SEPT. 28. 1911.

Patented May 24, r1921.

- /v VFA/Tan;

UNITED srrATEs'Y PATENT oFFicnj KNUT ROBERT JOHANv LAGUs, or ABO, FINLAND.

` :PORTABLE MOTORfSAW FOR FEELING TREES, CUTTING LOGS, AND SAWING ratenteaiuay 24, 1921.

Application mea september as, 1917. Vserali No. 193,529.

To all whom t may concern.' K

Be it known that I, KNUT ROBERT JOHAN LAGUs, a citizen of Finland, and resident of Slottsgatan 30, bo, Finland, have invented certain new and useful Improvements in Portable Motor-Saws for Felling Trees, Cutting Logs, and Sawing lVood, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a portable motorsaw, which,as required, may be used for felling trees, cutting logs as well as sawing wood. The said motor-saw comprises a horizontal ring, disk or the like rotatably mounted on a barrow or the like, .which ring, etc., carries a suitable motor and one or two sliding rods, whichrare reciprocated by the motor through a suitable motion transmitting device and carrying a saw-blade. Besides the said motoresaw is provided with a rod, which guides the saw-blade while it cuts intothe tree, and with a chain, wire rope orthe like fixed in a special manner and adapted to iirmly `connect the motorsaw with the tree, and with two adjusting screws for bringing the motor-saw in a horizontal position.

Figure 1 ofthe accompanying drawing is a plan view of the motor-saw adapted f'or tree-felling, and showing in dotted lines the position of the saw when used for sawing logs as shown in full lines in Fig. 2. Fig. 2 is a side view of the motor-saw, adapted for cutting logs or sawing wood, and showing in dotted lilies the position of the saw when used for felling trees. Fig. 3 is a perspective view of the crosshead for supporting the saw in either a horizontal or vertical position.

The motor-saw consists of a barrow, coinprising side bars 1 and cross bars 3, et and 5 connecting the saine. The cross bars 3 and 5 are bent downward and upward respectively into curves in order not to prevent the rods 6, sliding in bearings, from moving duringy the cutting operation. The cross bar 4 is journaled in the side bars 1 and has a vertical pin 7, on which a ring 8, disk or the like is mounted in a rotatable manner. VThe said ring 8 is provided with a handle 9,L by means of which the ring can be rotated manually in a horizontal direction around the pin 7 and in avertical direc'- tion on the rod 4. As the ring is rotated in a horizontal direction, it is supported by rollers 10, provided on arms 11, which are fixed to the side bars of the barrow by means of winged nuts. When the ring is tobe swung vertically, the saidarms 11 together with thev rollers are moved laterally -out of the path of the ring. i On the ring 8 a suitable motor 12 is fixed, in the present case an internal combustion engine cooled by air. Two rods 6 are mounted in a slidable mannerrinbearings provided on the ring 8,*which at their fore ends'are yconnected by a cross-head 1K3, in which a saw-blade 141: may be fixed in either a horizontal or avertical position.

The shaft 16er' the motor actuates by means of a gearing 17, 18 anda pitman 19 the'sliding rods 6 carryingthe saw-blade and reciprocates'the same. y y

A rod 20 is mounted in swingable. man? ner on a vertical pin providedon the vring Si, the fore end 21 of which rod 'is grooveshaped and guides the rear edge ot thesaw.- blade, while the blade starts itscutting into 'the tree, during the felling operation. The

said rod .20 is acted upon by a spring in suoli direction, that the end 21 always is forced against the saw-blade`and guides the saine, while it cuts into the tree. After the sawblade has cut into the tree for the greater part of its width it leaves the guide 20, 21, which then is forced by the spring against the side of the tree and the remaining stub. When the saw is to be used for cutting logs,

in which case the sav-blade operates in` vertical direction, the saw-blade is first mounted in a vertical position. The guiderod 20, 21 is removed at the screw-socket` joint 22 and is connected by means of a pin with a fork 23, fixed to the cross-bar The guide rod 20, 21 now actuates the `sawblade7 acted upon by a spring, as stated above, or by its own weight. y j

The tore end of the barrow is so arranged,

that it can be connected with the tree to be.

felled. In the form of the invention shown in the drawing the barrow is fixed :to the tree during the felling operation by means of a wire rope or a chain which is laid ies l The rear part of the barrow is raised or lowered by means of adjusting screws provided With crank handles 2S. The entire structure may be lifted by means` of thev ixe'd handles 29 and the fore movable han dles 30. For the felling of a tree the barrow is connected with the same as near the ground as possible, Whereaftei" the barrow is adjusted into a horizontal position by means of the screws operated by t-he cranks 28. The motor is .then started and the saiv blade is forced against the. tree by rotating the ring S horizontally `by means of the handle 9. As the motor-saw should be used for cutting logs, the barrosT is fixed to the log by means of the spikes 25, as stated above. The motor is then started and the saw-blade forced against the log by swinging` the ring 8 vertically on the cross bar fl by raising the handle 9.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: v

l. In `a motor saw, the combination of a portable frame, a horizontal ring, disk or the like, mounted in said frame for rotary and horizontally tilting movements, a motor carried by said ring, a rod slidingly mounted on ,said ring, means for xing a saw-blade to said rod in either a vertical or horizontal position, arms fixed to said frame, and roll- ,ers journaled on said arms for supporting said ring during the tree felling operation, said arms lbeing movable to clear the ring and permit the vertical tilting of said ring.

2. A motor saw comprising a frame, a horizontally disposed bar journaled in the frame, a pin formed on said bar, a Wheel journaled on said pin whereby said Wheel is capable of rotary movement in a horizontal plane and a tilting movement transversely to thel rotary movement, means adjustably mounted in said frame for rotatably supporting said Wheel and for preventing tilt ing;- movement thereof, and a saw blade guide member mounted for reciprocating movement on said Wheel.

3. A motor saw comprising a framaa shaft .journaled horizontally in said frame and adjustable vlongitudinally thereof, va

pin extendingV at right angles from saidy 

